2011 October 15 On 10-15-11 at 4:45pm a silver aluminum colored disc was traveling across the northern sky from east to west at great height, leaving a white contrail. I estimate it was likely 5 miles away, and at 20,000 feet in height. I watched it until it went out of sight behind trees. It appeared to me to be the same type of craft, I heard on 11-25-10, and saw on 01-04-11, 01-14-11, 02-05-11. and 3-16-11.